Exporting private key from Chrome extension from CLI

How can I export the private key from my wallet in the Chrome extension so I can import it for use with the CLI? It seems like the extension only lets me view the 24-word mnemonic, while the CLI expects a private key. Is there a CLI command for converting the 24-word mnemonic to a private key?

You can get the private key by entering your phrase into the CLI’s make_keychain command.

stx make_keychain <seed_phrase>.

The wallet doesn’t support this currently.